Why? Because I love coding on phone, and I want to write stuff for old phones on new phones.
Conclusions so far:
1. The less I/O in QEMU on Android - the better.
2. Use smallest possible apps with least possible processes.
3. Use dedicated small tools over all-in-one IDEs and stuff like that.
4. All I need is to compile, maybe occasionally check on accurate emulator. Actual testing can be done on host at proper speed and actual hardware.
5. WordPad is love.